81.3×21.4－21.4×0.3＋2.14×190简便计算

81.3×21.4－21.4×0.3＋2.14×190简便计算
81.3×21.4－21.4×0.3＋2.14×190简便计算

81.3×21.4－21.4×0.3＋2.14×190简便计算
首先知道2.14×190=21.4×19,然后把21.4提取出来就可以了
81.3×21.4－21.4×0.3＋2.14×190
=21.4(81.3-0.3+19)
=21.4 × 100
=2140

81.3×21.4－21.4×0.3＋2.14×190=21.4*(81.3+19-0.3)=21.4*100=2140
望采纳哦亲！